BMS_a085 — SW Pack Contactor Mismatch

Full alert identifier: BMS_a085_SW_Pack_Contactor_Mismatch

Message shown in the car

Vehicle shutting down - PULL OVER SAFELY Operation may be restored on next drive

Alert description

The Battery Management System (BMS) detects a mismatch between the actual and commanded pack contactor set state.

Potential impact

Inability to charge, drive, or support the Low Voltage (LV) system

Set condition

High voltage processor (HVP) comms are OK and pack contactors were closed and pack contactors are now open / opening and BMS_packContactorRequest has remained closed.

Clear condition

HVP_packContactorSetState is correct for the current BMS_packContactorRequest.

Signals to check

These diagnostic fields are associated with BMS_a085. Check the alert's Payload in Service Mode Plus for available values.

Signal	Unit
Pack Contactor Set Request `BMS_a085_packContactorSetRequest` 0 SNA 1 CLOSE 2 OPEN 3 OPEN IMMEDIATELY 4 CLOSE NEGATIVE ONLY 5 CLOSE POSITIVE ONLY	—
Pack Contactor Set Request Prev `BMS_a085_packContactorSetRequestPrev` 0 SNA 1 CLOSE 2 OPEN 3 OPEN IMMEDIATELY 4 CLOSE NEGATIVE ONLY 5 CLOSE POSITIVE ONLY	—
Pack Contactor Set State `BMS_a085_packContactorSetState`	—
Pack Contactor Set State Prev `BMS_a085_packContactorSetStatePrev`	—

Check other alerts

With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_a085.